I used to be able, since v5
at least to return a product to my supplier by clicking a button
called "Return" in the incoming shipment and have the possibility
to select the invoicing so that I could create a credit note
linked to my supplier.

This way I knew that my
supplier would eventually send me a credit note and/or the missing
product and the return physical move and invoicing were somehow
under control.

In v9, I have the
possibility to return the product (via a button called "Reverse"
which is a little bit weird in this case) but I am never given the
possibility to chose the invoicing type.

When I create the invoice
to my supplier, selecting the PO number, the "reversed" moves are
not deducted from the total quantity delivered.

Did somebody achieve what I
am trying to do which is return product to my supplier and have it
under control in my invoicing?